<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      @import url('https://fonts.googleapis.com/css?family=Exo:400,700');

      * {
        margin: 0px;
        padding: 0px;
      }

      body {
        font-family: 'Exo', sans-serif;
      }

      .area {
        background: #4e54c8;
        background: -webkit-linear-gradient(to left, #8f94fb, #4e54c8);
        width: 100%;
        height: 100vh;
      }

      .circles {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        overflow: hidden;
      }

      .circles li {
        position: absolute;
        display: block;
        list-style: none;
        width: 20px;
        height: 20px;
        background: rgba(255, 255, 255, 0.2);
        animation: animate 25s linear infinite;
        bottom: -150px;
      }

      .circles li:nth-child(1) {
        left: 25%;
        width: 80px;
        height: 80px;
        animation-delay: 0s;
      }

      .circles li:nth-child(2) {
        left: 10%;
        width: 20px;
        height: 20px;
        animation-delay: 2s;
        animation-duration: 12s;
      }

      .circles li:nth-child(3) {
        left: 70%;
        width: 20px;
        height: 20px;
        animation-delay: 4s;
      }

      .circles li:nth-child(4) {
        left: 40%;
        width: 60px;
        height: 60px;
        animation-delay: 0s;
        animation-duration: 18s;
      }

      .circles li:nth-child(5) {
        left: 65%;
        width: 20px;
        height: 20px;
        animation-delay: 0s;
      }

      .circles li:nth-child(6) {
        left: 75%;
        width: 110px;
        height: 110px;
        animation-delay: 3s;
      }

      .circles li:nth-child(7) {
        left: 35%;
        width: 150px;
        height: 150px;
        animation-delay: 7s;
      }

      .circles li:nth-child(8) {
        left: 50%;
        width: 25px;
        height: 25px;
        animation-delay: 15s;
        animation-duration: 45s;
      }

      .circles li:nth-child(9) {
        left: 20%;
        width: 15px;
        height: 15px;
        animation-delay: 2s;
        animation-duration: 35s;
      }

      .circles li:nth-child(10) {
        left: 85%;
        width: 150px;
        height: 150px;
        animation-delay: 0s;
        animation-duration: 11s;
      }

      @keyframes animate {
        0% {
          transform: translateY(0) rotate(0deg);
          opacity: 1;
          border-radius: 0;
        }

        100% {
          transform: translateY(-1000px) rotate(720deg);
          opacity: 0;
          border-radius: 50%;
        }
      }
    </style>
  </head>
  <body>
    <div class="area">
      <ul class="circles">
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
      </ul>
    </div>
  </body>
</html>
